Analysis on Operating Current Threshold of Atmosphere Controlled Container Environment Regulation System

In order to study the logic judgment basis for the fault diagnosis of atmosphere controlled container environment regulation system, an experimental platform for atmosphere controlled container environment regulation system is built, and the working current monitoring test of the equipment is carried out. The working current of the electric ball valve, the fan and the solenoid valve of the typical actuator and the threshold of the fault diagnosis are analyzed. The results show that: (1) the current threshold of the opening process of the electric ball valve is 0.033A~0.113A, the current threshold of the holding process is 0.01A~0.025A, the threshold of the closing process is 0.015A~0.095A, and the current threshold of the process is 0.002A~0.01A after closing. (2) when PWM is 0%~20%, the characteristic equation of the normal working current of the fan is 0.002x2+0.013x; when PWM is 20%~100%, the characteristic equation of the normal working current of the fan is 0.003x+1.265. (3) the normal working current thresholds of solenoid valves and humidifier are 0.42A~0.51A and 0.44A~0.53A respectively. The results of experiment and analysis can provide references for the study of fault diagnosis decision making for transport equipment with modified atmosphere.